 package com.dwjm.util;
 
 import java.io.UnsupportedEncodingException;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 
 public class Md5Encrypt
 {
   private static final char[] DIGITS = { '0', '1', '2', '3', '4', '5', '6', 
     '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
 
   public static String md5(String text)
   {
     MessageDigest msgDigest = null;
     try
     {
       msgDigest = MessageDigest.getInstance("MD5");
     } catch (NoSuchAlgorithmException e) {
       throw new IllegalStateException(
         "System doesn't support MD5 algorithm.");
     }
     try
     {
       msgDigest.update(text.getBytes("utf-8"));
     }
     catch (UnsupportedEncodingException e)
     {
       throw new IllegalStateException(
         "System doesn't support your  EncodingException.");
     }
 
     byte[] bytes = msgDigest.digest();
 
     String md5Str = new String(encodeHex(bytes));
 
     return md5Str;
   }
 
   public static char[] encodeHex(byte[] data)
   {
     int l = data.length;
 
     char[] out = new char[l << 1];
 
     int i = 0; for (int j = 0; i < l; i++) {
       out[(j++)] = DIGITS[((0xF0 & data[i]) >>> 4)];
       out[(j++)] = DIGITS[(0xF & data[i])];
     }
 
     return out;
   }
 }
